I know you (A Frans and Chasriel Story)

monsters were never released because Frisk decided to give Asriel and Chara each a soul. sure, the monsters hated them at first but Sans helped Frisk to be loved by the monsters and he succeeded.

And now they are living peacefully in the underground, not being bothered by a single monster.

then, Frans and Chasriel comes in. they've been lovers for about 3 years now. sans and Asriel claims that they know their girlfriends more than anything in the whole underground.

That's where things get wrong.... or... in other words....

That's where their love, faith and trust gets tested...

and there was only one rule... it was:
"one wrong word, will change EVERYTHING"